| ??? 05/29/05 16:06 Read: times |
#94089 - Correct !! Responding to: ???'s previous message |
You are correct. With respect to the first circuit that you posted at:
http://img28.echo.cx/img28/369...5747ly.jpg Forward diode current flows when you intend to turn the device ON. As a consequence of this, current will flow in the collector circuit when the device is ON. With a 5V supply and a 1K resistor as shown this will nominally be about 4.5 to 5 mA of collector current in the opto-coupler (guessing at a VCESATin the transistor of a little less than half a volt or so). It is not quite clear what Erik was trying to say. Michael Karas |
| Topic | Author | Date |
| CNX83: application examples? | 01/01/70 00:00 | |
| HOW | 01/01/70 00:00 | |
| did you find some in a drawer | 01/01/70 00:00 | |
| I know they're quite old... | 01/01/70 00:00 | |
| Better | 01/01/70 00:00 | |
| Schmitt Trigger | 01/01/70 00:00 | |
| nothing wrong - but | 01/01/70 00:00 | |
| Not working, Erik | 01/01/70 00:00 | |
| Pullup Or Not | 01/01/70 00:00 | |
| Additional Comment on Rise Time | 01/01/70 00:00 | |
| Confustion maybe? | 01/01/70 00:00 | |
| Yes, you need on PCF8574 | 01/01/70 00:00 | |
| No hijacking at all!!! ;-) | 01/01/70 00:00 | |
| Walks like a duck? Quacks like a duck? | 01/01/70 00:00 | |
| Yes, I do have quite a few ducks... | 01/01/70 00:00 | |
| Correct? | 01/01/70 00:00 | |
| Correct !! | 01/01/70 00:00 | |
| you must have edited | 01/01/70 00:00 | |
| I didn't do anything... | 01/01/70 00:00 | |
I do not know | 01/01/70 00:00 |